XTL751-S999-544

Crystals Overview

The Siward XTL751-S999-544 is a passive quartz crystal resonator designed for precision frequency control applications. It operates at a nominal frequency of 32.768 kHz, making it suitable for real-time clock circuits and low-frequency timing references. The component features an equivalent series resistance (ESR) of 90 kOhms and requires an external load capacitance of 12.5 pF for optimal performance. It supports a frequency tolerance of ±20 ppm and functions within an operating temperature range of -40°C to +85°C. The device utilizes a surface-mount package configuration.

Crystals Feature Summary

• Utilizes quartz piezoelectric effect for stable frequency generation
• Optimized for low-power real-time clock applications
• Surface-mount design for automated assembly integration

Crystals Applications

• Real-time clock circuits in consumer electronics
• Microcontroller system timing references
• Portable battery-powered devices requiring low standby current

Crystals Procurement Notes

Verify the specific package dimensions and terminal availability against the manufacturer's official mechanical drawing before integration. Confirm that the required load capacitance matches the target circuit design parameters. Ensure the supplier provides traceable documentation regarding the manufacturing origin and quality standards associated with the batch.

Crystals Selection Notes

Select this component when a standard 32.768 kHz reference is required for timekeeping functions. Consider the ±20 ppm tolerance sufficient for general consumer applications where high-precision atomic stability is not mandated. Evaluate the 90 kOhm ESR to ensure compatibility with the oscillator circuit's drive level constraints and startup requirements.

Crystals Part Context

This part belongs to Siward's portfolio of passive quartz crystal resonators. The company specializes in frequency control elements, including tuning fork crystals and SAW wafers. This specific model represents a standard commercial-grade solution for embedded timing needs within their broader catalog of electronic components.

Crystals Replacement Considerations

Cross-reference with other 32.768 kHz SMD crystals from manufacturers such as Epson or Murata. Verify that substitute parts match the 12.5 pF load capacitance and 90 kOhm ESR specifications to maintain circuit stability without redesign.